Hey guys, just thought I would give a little update on where I am. Here are the dimensions I am planning to go with:
60%- 30cm x 11cm x 3.5cm (11.81in x 4.33in x 1.38in)
TKL- 37.5cm x 15cm x 4cm (14.76in x 5.91in x 1.57in)
Full-Size - 48cm x 20cm x 5.08cm (18.9in x 7.87in x 2in)
The 60% should fit about everything except the ducky mini. Of course it will also work with smaller 40% KBs as well. TKL should fit about everything in that category. Now for full-size, I decided to make it a bit larger. This way it can fit G80s and most model Ms. So if you have a regular full-size like a Ducky or Filco, it will be a bit oversized. If anyone has an issue with that, let me know now and I will consider making it smaller and saving the G80/Model M idea for later.
As far as the cable slot goes, I am planning to make the slot run about the length of the cover in the back. This should provide room for your cable no matter the position. However, another thing I can do is put in two smaller slots. For 60% it could be on the left and in the middle, and for Full size it could be on the right and middle since that is where the cable is on most of these keyboards. For TKL, most are in or near the middle, so it would just have a long middle slot.
Let me know what you guys think about those dimensions and if you think there is any room for improvement. If there are no big issues, I will go ahead and start the GB this week.